IO-390-D Series Engine Maintenance Manual
05-00
© 2020 Avco Corporation. All Rights Reserved
Page 4
March 2020
IO-390-D Series Engine Maintenance Manual
(5)
The cotter pin head must install as a snug fit into the castellation of the nut. Unless
otherwise specified, bend one end of the cotter pin back over the stud or bolt and the
other end flat against the nut.
(6)
Torque a castellated or slotted nut to the value specified in this manual or the latest
revision of the
Service Table of Limits - SSP-1776
, if necessary, turn the nut up to one
additional hex to align the slot in the nut with the hole in the bolt.
(7)
If a lockplate is required when installing a bolt, torque the nut to the value specified in
this manual or the latest revision of the
Service Table of Limits - SSP-1776
. If necessary,
turn the nut up to one additional hex to align the flat on the nut with the tab on the
lockplate. Lockplate tabs must not be bent up on the corner of the nut.
(8)
Replace any damaged or unserviceable hardware, fasteners, studs, screws, bolts, nuts,
washers, and clamps with new parts.
(9)
Always replace lock washers and lock nuts with new lock washers and lock nuts.
(10)
Although the latest revision of Service Bulletin No. SB-240 identifies parts which must
be replaced after they are removed, in the case where other parts are removed, it is
recommended practice, prior to installation, to examine each part for damage or wear
and replace the part as needed in accordance with accepted practices and standards to
ensure that serviceable parts are installed on the engine.
G.
Unless otherwise specified in this manual, refer to the latest revision of the
Service Table of
Limits - SSP-1776
for:
•
Standard torque values for fittings, plugs, and hardware fasteners
•
Special torque requirements for fittings, valves, clamps, couplings, plugs, and other
hardware fasteners in various locations on the engine
•
Dimensions
•
Clearances
•
Measurements
H.
Specific engine parts must be lubricated prior to installation. If parts are not correctly
lubricated, or if an unapproved lubricant is used, engine parts could become scored before the
engine oil has lubricated the engine during the first cycle of operation. This scoring can cause
premature part failure, or, in some cases, engine failure. As preventive action, during engine
component replacement, apply the approved lubricant for specified components identified in
the latest revision of Service Instruction No. SI-1059.
I.
If an engine start is required to complete a maintenance procedure, make sure that if you do
not see oil pressure (greater than 0) indication within 10 seconds after engine start or oil
pressure does
not
continue to increase above the published minimum pressure in the next 20
seconds, stop the engine. Identify and correct the problem before another engine start.
J.
Complete the Operational Ground Check prior to and after each inspection, after
maintenance, and engine assembly. Refer to Chapter 72-00.
